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Microchip Technology 1N4738E3/TR13
- Part No.:
- 1N4738E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4738E3/TR13.pdf
- Description:
- DIODE ZENER 8.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,142
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Product details
Overview
1N4738E3/TR13 from Microsemi is a 1.0 W silicon Zener diode with nominal Zener voltage of 8.2 V ±5%, DO-41 axial-leaded plastic package, 31 mA test current (IZT), and 4.5 Ω dynamic impedance at IZT. It regulates voltage in power supply reference and overvoltage protection circuits across -65°C to +150°C.
For engineers reviewing the 1N4738E3/TR13 datasheet, 1N4738E3/TR13 pinout, 1N4738E3/TR13 application, or 1N4738E3/TR13 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (500 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR13).
Technical Context
This device operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its 8.2 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, with specified knee impedance (110 Ω at 0.5 mA) and low leakage (<10 μA at 6.5 V).
The DO-41 package provides flexible through-hole mounting with cathode band polarity marking, tin-lead or RoHS-compliant annealed matte-tin terminals, and UL94V-0 void-free epoxy encapsulation rated for 260°C soldering (10 s max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 8.2 V ±5% at 31 mA - defines precise regulation point for reference design |
| Power Dissipation | 1.0 W at 25°C lead temperature - sets maximum continuous DC power handling |
| Dynamic Impedance (ZZT) | 4.5 Ω at 31 mA - determines output voltage stability under load variation |
| Max Reverse Current | 10 μA at 6.5 V - ensures low leakage in standby or precision bias applications |
| Thermal Resistance | 45°C/W junction-to-lead (3/8" lead length) - guides heatsinking and PCB layout for thermal reliability |
| Surge Current (ISM) | 500 mA (½-sine, 1/120 s) - supports transient overvoltage clamping capability |
| Operating Temp | -65°C to +150°C - enables use in industrial, automotive, and aerospace environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node during Zener operation; forward voltage ≤1.2 V @200 mA |
| Cathode | Regulated output terminal | Banded end; held at stable 8.2 V above anode when reverse current ≥31 mA |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully compliant with JEDEC 1N4738A specification for interchangeability and testing consistency |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU without lead or hazardous substances |
| Tape-and-reel packaging | TR13 designation indicates EIA-296 standard reel format for automated SMT-compatible through-hole placement |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and storage logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener reference element providing fixed 8.2 V基准 for error amplifier input. Use Value: Maintains ±5% output accuracy over 10–100 mA load range and -40°C to +85°C ambient. | Use Scenario: Clamping transient spikes on 5 V or 12 V rail inputs in industrial control modules. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when voltage exceeds 8.2 V. Use Value: Limits peak voltage to ≤9.1 V (Vz + 10%) during 500 mA surge events per JEDEC spec. |
| Voltage Monitor Circuit | Signal Level Translation |
Use Scenario: Detecting brownout conditions in microcontroller reset circuits using resistor-divider + Zener threshold. IC Role / Device Role / Timing Role: Precision voltage threshold detector with defined 8.2 V turn-on point. Use Value: Enables reliable reset assertion at 8.2 V ±0.41 V across full temperature range. | Use Scenario: Biasing logic-level shifters between 3.3 V and 5 V domains in mixed-voltage FPGA interfaces. IC Role / Device Role / Timing Role: Clamp diode establishing 8.2 V upper rail for level-shifting transistor base drive. Use Value: Prevents saturation of interface transistors while maintaining fast edge integrity via low ZZT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | No "e3" RoHS suffix; tin-lead plating; same electrical specs and DO-41 package | Not suitable for RoHS-compliant production; requires Pb-containing solder process | Select only for legacy non-RoHS systems or where tin-lead finish is mandated |
| MMSZ4704T1G | Surface-mount SOD-123 package; 8.2 V ±5%; 500 mW rating; higher ZZT (15 Ω) | Limited to lower-power applications; incompatible with through-hole assembly | Choose for space-constrained PCBs where 1 W dissipation is not required |
Compared with 1N4738A and MMSZ4704T1G, the 1N4738E3/TR13 uniquely combines full 1 W power rating, RoHS compliance, tape-and-reel automation support, and proven DO-41 mechanical robustness for high-reliability through-hole designs.
Availability
1N4738E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom infrastructure equipment requiring stable component supply and long-term lifecycle continuity.
Supply support for 1N4738E3/TR13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xx series was designed specifically for general-purpose voltage regulation and reference applications where robustness, wide temperature operation, and JEDEC-standard interchangeability are critical.
FAQ
What is the Zener voltage tolerance for 1N4738E3/TR13?
The 1N4738E3/TR13 has a nominal Zener voltage of 8.2 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC base number 1N4738A. This tolerance applies at 31 mA test current and 25°C lead temperature, and is maintained across the full operating temperature range of -65°C to +150°C per Microsemi's published specifications.
Does 1N4738E3/TR13 require dry packing before PCB assembly?
No, the 1N4738E3/TR13 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to reflow or wave soldering. Its void-free epoxy encapsulation and RoHS-compliant matte-tin plating ensure safe handling under standard factory conditions without humidity-related risks.
What is the maximum surge current rating for 1N4738E3/TR13?
The 1N4738E3/TR13 has a maximum surge current (ISM) rating of 500 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating supports transient overvoltage clamping in power rails and protects downstream circuitry from short-duration spikes without degradation.
Can 1N4738E3/TR13 be used in surface-mount designs?
No - the 1N4738E3/TR13 uses a DO-41 axial-leaded package intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMAJ4738A and MLL4738A in SMA and SOD-123 packages respectively; these share the same 8.2 V Zener voltage but differ in power rating, impedance, and thermal performance.
What does the "TR13" suffix indicate in 1N4738E3/TR13?
"TR13" denotes EIA-296 standard tape-and-reel packaging: 13-inch reels containing quantities appropriate for automated pick-and-place insertion. This format supports high-volume manufacturing and ensures consistent orientation (cathode band facing up) for reliable through-hole placement of the 1N4738E3/TR13.
1N4738E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4738E3/TR13 FAQ
1.How can I place an order for 1N4738E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4738E3/TR13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N4738E3/TR13 reliable?
The price and inventory of 1N4738E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4738E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4738E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4738E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4738E3/TR13?
1N4738E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4738E3/TR13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N4738E3/TR13?
For technical support, including 1N4738E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4738E3/TR13 requirements.
6.How does Aetrix verify that 1N4738E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4738E3/TR13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N4738E3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4738E3/TR13?
All 1N4738E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4738E3/TR13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N4738E3/TR13 part is unused and in its original packaging.
Return procedure for 1N4738E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4738E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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